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I had the chance to pick up a new sundown u series 12 d2 last week. Drove down to buffalo from toronto to grab it to save on shipping.

Before leaving i removed my sa12 from its enclosure which was about 1.85 net tuned to 34hz with 26 sq inches of port area. When i got to buffalo i put the U 12 into the same box roughly now giving it 1.8 cubes and 35hz or so and 2000rms

I didnt pound on it for a few days to allow break in..(if that even exists) after a few days i got home and started giving it more and more.

I am very pleased. Visually and audibly Its like an sa12 but on steroids. Id say its very close to a zv3 in terms of sound and output but much cheaper. Maybe like a zv3 jr. Size wise, weight wise and visually its right in the middle of the sa12 and zv3. Those 3 subs are like brothers.

Hits hard and has a classic bass sound. Wish i had space to run 2 of these. Sundown did a great job designing these. It sounds fantastic. Very happy i picked one up. Totally worth the drive.

Will soon put it in a 1.7 to 1.75 net box with 39 sq inches of port. Hopefully that enclosure will make this sub come alive even more.

I highly suggest this sub and if you are thinking of getting an sa12 set up its worth the extra 150 or so to upgrade to these instead trust me!

Too early for sundown to release box specs and full ts parameters. Ive been dying to know as well. Only thing i was told is that these will work in the same enclosure that you would use for a sa and zv3.. I am assuming it would work in sealed box as both those subs will as well.

Im currently using it in a 1.8 or so 34hz 26 sq in port area slot box. It sounds good but i think more port area will allow for more output..will know by monday night cant wait.

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How hard do the u series hit? Is there a significant difference between the u series and the sa series?

The SA 12s are STILL prob the best sub you could get at its price point however when compared to the U series..

yes there is a difference, they hit harder and take more power. As i stated before, its like an SA on steroids. With the release of these U series subs, it is my opinion and feeling that it officially and firmly places the SA series into the ENTRY level category (I know they were kinda already there but now its like official). For those looking to do a common dual 12 set up with the popular sa12s,. i would spend the extra money and upgrade to 2 12 Us instead,.. they will work in the same space/enclosure as the SAs but will require more power. End result will be totally worth it.

After getting this U sub I am now debating whether to keep my sa12 as a back up emergency sub or just sell it off..